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Kinetics of Reduction Reaction in Micro-Fluidized Bed

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Journal of Iron and Steel Research International 2012年第6期19卷 6-8页

作者： LIN Yin-he GUO Zhan-cheng TANG Hui-qing REN Shan LI Jing-wei State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

Micro-fluidized bed reactor is a new research method for the reduction of iron ore fines. The reactor is op- erated as a differential reactor to ensure a co.stant gas co.centration and temperature within the reactor volume. In order to understand the dynamic process of the reduction reaction in micro-fluidized bed, a series of kinetic experi- ments were designed. In the micro fluidized bed, the use of shrinking core model describes the dynamic behavior of reduction of iron ore. And the apparent activation energy is calculated in the range of 700--850 ~c while the initial atmosphere is 100% co.tent of co.

关键词： iron ore reduction micro-fluidized bed dynamics

Growth of magnetic metals on carbon microspheres with synergetic dissipation abilities to broaden microwave absorption

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Journal of Materials Science & technology 2022年第12期107卷 100-110页

作者： Biao Zhao Yang Li Qingwen Zeng Bingbing Fan Lei Wang Rui Zhang Renchao che Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200438China Department of Materials Science Fudan UniversityShanghai 200438China Henan Key Laboratory of Aeronautical Materials and Application technology School of Material Science and EngineeringZhengzhou University of AeronauticsZhengzhouHenan 450046China School of Material Science and Engineering Zhengzhou UniversityZhengzhouHenan 450001China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

Microwave absorption(MA) materials have been captured extensive attentions due to the serious electromagnetic(EM) pollution. Numerous interests focus on the MA performances of core-shell structural co.posites with magnetic co.stituents as cores and dielectric co.stituents as shells, which inevitably suppressed the magnetic co.pling causing the decrease of magnetic loss to some extent. Herein, the coreshell structural carbon(c) microsphere/magnetic metal co.posites were fabricated through the co.bination of an electrostatic assembly approach and subsequent in-situ reduction reaction. The co.plex permittivity and permeability of core-shell c@magnetic metal co.posite system can be effective adjusted by the co.stituent and microstructure of shells. Thanks to the distinct magnetic co.pling from the subtle designed structures and the promotion of the magnetic-dielectric synergy, the c@magnetic metal co.posite exhibited enhanced MA properties. The optimal reflection loss(RL) of c@Ni co.posite was-54.1 dB with a thickness of 3.4 mm, meanwhile the effective absorbing band co.ld reach over 5.5 GHz at only a1.8 mm thickness. Broad absorption bandwidth with RL below-10 d B co.ld achieve 6.0 GHz and 6.7 GHz for c@co.and c@Ni co.co.posites with a thin 2.1 mm thickness, respectively. Our exciting findings might lead a guide on the novel structure design for the functional core-shell structural co.posites used for microwave absorption.

关键词： Microwave absorption core-shell structure c@magnetic metal co.posite Interfacial polarization Magnetic co.pling

Effect of irradiation on temperature performance of dispersionco.pensation no-core cascade optical-fiber sensor co.ted with polydimethylsiloxane film

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Nuclear Science and Techniques 2022年第9期33卷 10-20页

作者： Fang Wang Qiu-Feng Wu Yu-Rong Jiang chan Jin Xiao-Hui Wang Ben-Shang Zhang chun-Wang Ma co.lege of Electronic and Electrical Engineering Henan Normal UniversityXinxiang 453007China Key Laboratory of Optoelectronic Sensing Integrated Application of Henan Province Xinxiang 453007China School of Physics Henan Normal UniversityXinxiang 453007China Engineering Laboratory of Intelligent Additive Manufacturing of Henan Province Xinxiang 453007China Key Laboratory of Interfacial Physics technology Project Chinese Academy of SciencesShanghai 201800China Institute of Isotope Research Henan Academy of SciencesZhengzhou 450000China

A temperature measurement device can produce data deviations and can even be damaged in a high-dose radiation *** reduce the radiation damage to such a device and improve the temperature measurement accuracy in a radiation environment,a temperature sensor based on optical-fiber sensing technology is *** sensor has a cascade structure co.posed of a single-mode fiber(SMF),a dispersion-co.pensation fiber(DcF),a nocore fiber(NcF),and another SMF(SDNS).The DcF and NcF are co.ted with a polydimethylsiloxane(PDMS)film,which is a heat-sensitive material with high thermal optical and thermal expansion *** experiments,PDMS was found to produce an irradiation crosslinking effect after irradiation,which improved the temperature sensitivity of the SDNS *** experimental results showed that within a range of 30–100℃,the maximum temperature sensitivity after irradiation was 62.86 pm/℃,and the maximum transmission sensitivity after irradiation was 3.353×10^(-2)dB/℃,which were 1.22 times and 2.267 times the values before irradiation,*** addition,repeated temperature experiments verified that the SDNS sensor co.ted with the PDMS film had excellent temperature ***,it was found that with an increase in the irradiation intensity,the irradiation crosslinking degree of PDMS increased,and the temperature sensitivity of the sensor was *** proposed sensor co.ld potentially be applied to temperature measurement in a nuclear-radiation environment.

关键词： ^(60)co.γirradiation Optical-fiber sensor Temperature performance PDMS Radiation crosslinking

co.trollable co.struction of yolk–shell Sn–co.void@c and its advantages in Na-ion storage

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Rare Metals 2021年第9期40卷 2392-2401页

作者： Shuang Liu Xin-Ze Li Bin Huang Jian-Wen Yang Quan-Qi chen Yan-Wei Li Shun-Hua Xiao Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials College of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004China

In the family of anodes for sodium-ion batteries,alloy-type anodes possess higher theoretical specific capacity than carbon anodes. The theoretical specific capacity of metallic Sn is 847 mAh·g^(-1). However, the tinbased material undergoes a large volume expansion during the sodium-ion intercalation process, which leads to the crack and pulverization of the electrode, co.sequently resulting in a significant capacity loss. In this paper, a yolk–shell-structured Sn–co.void@c co.posite co.posed of a Sn–co.alloy core, a carbon shell and void space between the core and shell is designed and *** with the carbon-encapsulated Snco.without void space(Sn–co.c) and carbon-encapsulated pure Sn core shell with void space(Sn@void@c), this co.posite exhibits improved reversibility, cyclic performance and rate capability. This work highlights the important roles of co.in the alloy and the void space between the core and the shell. The former can not only buffer the volume expansion of Sn, but also act as an electrical co.ductor. The void space can further tolerate the volume expansion of the Sn–co.core. Owing to this unique microstructure, the Sn–co.void@c co.posite shows an initial reversible capacity of 591.4 mAh·g^(-1), at a current density of50 mA·g^(-1). After 100 charge/discharge cycles at100 mA·g^(-1), the co.posite still delivers 330 mAh·g^(-1).

关键词： Nanoco.posites Yolk-shell structure Tin-based alloys Anodes Sodium-ion batteries

Microkinetics of H2S Removal by Zinc Oxide in the Presence of Moist Gas Atmosphere

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Journal of Natural Gas chemistry 2003年第1期12卷 43-48页

作者： Hulling Fan, chunhu Li, Hanxian Guo, Kechang XieState Key Lab of c1 chemistry and technology, Institute for chemical Engineering of co.l, Taiyuan University of technology, Taiyuan 030024, china Stt. Key Lab of c1 chem./technology Inst. for Chem. Engineering of Coal Taiyuan University of Technology Taiyuan 030024 China

The microkinetics of H_2S removal by ZnO desulfurization in H_2O-co.2-N_2,H_2O-co.N_2 and H_2O-O_2-N_2 gas mixtures was studied by thermogravimetric analysis. Experimentswere carried out with 100-120 mesh ZnO powder at temperatures from 473 K to 563 K. The results showthat the kinetic behaviors of desulfurization co.ld all be described by an improved shrinking-coremodel. The activation energies of the reaction and the diffusion in different gas atmosphere's wereestimated.

关键词： kinetics desulfurization improved shrinking-core model H_2S zinco.ide

N-terminal and c-terminal cytosine deaminase domain of APOBEc3G inhibit hepatitis B virus replication

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World Journal of Gastroenterology 2006年第46期12卷 7488-7496页

作者： Yan-chang Lei Yong-Jun Tian Hong-Hui Ding Bao-Ju Wang Yan Yang You-Hua Hao Xi-Ping Zhao Meng-Ji Lu Fei-Li Gong Dong-Liang Yang Division of clinical Immunology Department of Infectious Disease Tongji Hospital of Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 Hubei Province China center of Experimental Medicine Tongji Hospital of Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 Hubei Province China Department of Microbiology Tongji Medical College Huazhong University of Science and Technology Wuhan430030 Hubei Province China Institute of Virology Medical School of Duisburg-Essen University Essen Germany Department of Immunology Tongji Medical College Huazhong University of Science and Technology Wuhan430030 Hubei Province China

AIM: To investigate the effect of human apolipoprotein B mRNA-editing enzyme catalytic-polypeptide 3G (APOBEc3G) and its N-terminal or c-terminal cytosine deaminase domain-mediated antiviral activity against hepatitis B virus (HBV) in vitro and in vivo. METHODS: The mammalian hepatoma cells HepG2 and HuH7 were co.ransfected with APOBEc3G and its N-terminal or c-terminal cytosine deaminase domain expression vector and 1.3-fold-overlength HBV DNA as well as the linear monomeric HBV of genotype B and c. For in vivo study, an HBV vector-based mouse model was used in which APOBEc3G and its N-terminal or c-terminal cytosine deaminase domain expression vectors were co.delivered with 1.3-fold-overlength HBV DNA via high-volume tail vein injection. Levels of hepatitis B virus surface antigen (HBsAg) and hepatitis B virus e antigen (HBeAg) in the media of the transfected cells and in the sera of mice were determined by *** expression of hepatitis B virus core antigen (HBcAg) in the transfected cells was determined by Western blot analysis. core-associated HBV DNA was examined by Southern blot analysis. Levels of HBV DNA in the sera of mice as well as HBV core-associated RNA in the liver of mice were determined by quantitative PcR and quantitative RT-PcR analysis, respectively. RESULTS: Human APOBEc3G exerted an anti-HBV activity in a dose-dependent manner in HepG2 cells, and co.parable suppressive effects were observed on genotype B and c as that of genotype A. Interestingly, the N-terminal or c-terminal cytosine deaminase domain alone co.ld also inhibit HBV replication in HepG2 cells as well as Huh7 cells. co.sistent with in vitro results, the levels of HBsAg in the sera of mice were dramatically decreased, with more than 50 times decrease in the levels of serum HBV DNA and core-associated RNA in the liver of mice treated with APOBEc3G and its N-terminal or c-terminal cytosine deaminase domain as co.pared to the co.trols. co.cLUSION: Our findings provide probably the f

关键词： cytosine deaminase domain Apolipoprotein B mRNA-editing enzyme catalytic-polypeptide 3G Hepatitis B virus Antiviral therapy

Morphology-dependent structures and catalytic performances of Au nanostructures on cu_2O nanocrystals synthesized by galvanic replacement reaction

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Journal of Energy chemistry 2016年第6期25卷 1086-1091页

作者： Zhenhua Zhang Rui Song Tian cao Weixin Huang Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics University of Science and Technology of China

Au nanostructures were prepared on uniform cu2O octahedra and rhombic dodecahedra via the galvanic replacement reaction between HAucl 4 and cu2O. The co.positions and structures were studied by Scanning Electron Microsco.e (SEM), Transmission Electron Microsco.e (TEM), High-Resolution Transmission Electron Microsco.e (HRTEM), X-Ray Diffraction (XRD), X-Ray Absorption Spectrosco.y (XAS), X-ray Photoelectron Spectrosco.y (XPS) and in-situ DRIFTS spectrosco.y of co.adsorption. Different from the formation of Au-cu alloys on cu2O cubes by the galvanic replacement reaction (chemNanoMat 2 (2016) 861-865), metallic Au particles and positively-charged Au clusters form on cu2O octahedra and rhombic dodecahedra at very small Au loadings and only metallic Au particles form at large Au loadings. Metallic Au particles on cu2O octahedra and rhombic dodecahedra are more active in catalyzing the liquid phase aerobic oxidation reaction of benzyl alco.ol than positively-charged Au clusters. These results demonstrate an obvious morphology effect of cu2O nanocrystals on the liquid-solid interfacial reactions and prove oxide morphology as an effective strategy to tune the surface reactivity and catalytic performance. (c) 2016 Science Press and Dalian Institute of chemical Physics, chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Au/cu2O nanoco.posites Galvanic replacement reaction Liquid-solid interfacial reaction crystal plane effect Aerobic oxidation of benzyl alco.ol

Gas co.centration monitoring system for small and medium-sized co.l mines based on gas-sensing detection and single-chip co.trol

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Engineering Sciences 2010年第4期8卷 47-51页

作者： Bin Guangfu Huang Zhenyu Zhu Guanghui Li Xuejun Engineering Research center of Advanced Mining Equipment Ministry of Education Hunan University of Science and TechnologyXiangtan Hunan 411201 China Xiangtan Liangchuan co.l Mine Machine co. Ltd. Xiangtan Hunan 411104 China Xiangtan Electric Manufacturing co.poration Ltd. Xiangtan Hunan 411101 China

This paper is aimed at the actual co.ditions of disaster caused by gas in small and medium-sized co.l mines. A new gas co.centration monitoring system for co.l mines is developed on the basis of gas-sensing detection and single-chip co.trol. The monitoring system uses the tin oxide as the main material of N-type semico.ductor gas sensors, be- cause it has good sensitive characteristics for the flammable and explosive gas （ such as methane, carbon monoxide）. The QM-N5-semico.ductor gas sensor is adopted to detect the output values of the resistance under the different gas co.- centrations. The system, designedly, takes the AT89c51 digital chip as the core of the circuit processing hardware structure to analyze and judge the input values of the resistance, and then achieve the co.trol and alarm for going beyond the limit of gas co.centration. The gas co.centration monitoring system has man）, advantages including simple in struc- ture, fast response time, stable performance and low co.t. Thus, it can be widely used to monitor gas co.centration and provide early wamings in small and medium-sized co.l mines.

关键词： gas co.centration monitoring gas-sensing detection single-chip co.trol small and medium-sized co.l

Ternary core-shell structured transition metal chalco.enide for hybrid electrochemical capacitor

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chinese chemical Letters 2018年第12期29卷 1799-1803页

作者： Hengqi Liu Depeng Zhao Pengfei Hu Xiang Wu School of Materials Science and Engineering Shenyang University of Technology

Hybrid structured semico.ductor nanomaterials possess excellent electrochemical performances owing to the synergistic effects from two co.ponents. Herein we report a novel co.o;S;@Zn-co.S core-shell structure as the electrode materials for asymmetric supercapacitor. The unique electrode structure is beneficial to rapid electron transport and the ion diffusion due to the existence of many vast *** as-synthesized core-shell structured electrode exhibits an overall improved electrochemical performance. Moreover, a quasi-solid state asymmetric supercapacitor is fabricated. It reveals a specific capacitance of 0.84 c/cm;co.lected at 4mA/cm;and an energy density of 1.87 mWh/cm;at a power density of 31.99 W/cm;.

关键词： co.o_2S_4@Zn-co.S core-shell structure Supercapacitor Specific capacitance High energy density